Hello, things were working fine for many years, and now they are not. My Macbook Mac Mail does not work anymore with my work email over WiFi (Archer C9) at home. I have 2 email accounts, one with Gmail and one for Work. 

In Summary, ...

Works Correctly

- Macbook Mac Mail at Work over ethernet, both gmail and work email work correctly. 

- Macbook Mac Mail at Home over neighbors WiFi, both gmail and work email work correctly. 

- Macbook Mac Mail at Home over my WiFi, only gmail works correctly. 

Works Incorrectly

- Macbook Mac Mail at Home over my WiFi, work email does not work. 

I've upgraded to the latest firmware on the C9. 

Ideas?